HV9901

HV9901 Universal Relay Driver Features ► 10 to 450V input voltage range ► Energy saving hold current mode ► Adjustable microcontroller supply ► Low supply current <1.0mA ► Constant current coil ► Programmable pull-in current, pull-in time, and hold current ► Efficient PWM operation using the relay coils’ inductance Applications ► Industrial controls ► Relay timers ► Solenoid drivers ► Home automation General Description The Supertex HV9901 is a BiCMOS/DMOS universal relay driver that employs PWM switching techniques. It is designed for efficient and energysaving operation of a low voltage relay with supply voltages ranging from 10 to 450V DC through utilization of the relay coils’ inductance. The circuit is capable of operating over a wide input voltage range without requiring a change of any external components. For example, this will enable users to use 5.0V coil relays for DC voltages 10 to 450V or AC voltages up to 240V. The HV9901 has an internal hig...